Loud blasts from apparent NATO airstrikes have rocked the Libyan capital, while fierce fighting has erupted between government forces and rebels near a western oil port.

Western news reports say several loud explosions shook Tripoli late Saturday after what had been a mostly quiet day in the capital.

Meanwhile, witnesses say clashes have erupted between forces loyal to Libyan leader Moammar Gadhafi and rebels in Zawiya, a oil port town about 50 kilometers west of Tripoli. A highway that serves as a major supply route between Tripoli and Tunisia is closed as a result of the unrest.

Rebels briefly took control of Zawiya in March but were beaten back by pro-Gadhafi forces.

Pro-government forces have also been pounding targets in the western town of Zlitan as well as in the rebel-held city of Misrata, where medical officials say at least 30 people were killed on Friday.

U.S. officials traveling with Secretary of State Hillary Clinton in Africa say Libya's situation will be featured prominently in her remarks on Tuesday at an African Union meeting in Ethiopia.

There was no indication Mr. Gadhafi was ready to end his reign, but Turkish Prime Minister Recep Tayyip Erdogan said Friday his government has offered him "guarantees" if he were to leave the country.

He did not specify the nature of the guarantees. But he said Turkey would help Mr. Gadhafi get to where he "would like." Mr. Erdogan said he was still awaiting a reply from Tripoli.

U.S. Secretary of State John Kerry has told his Russian counterpart, Sergei Lavrov, that his country could face further consequences to what he called its “already strained economy” if Moscow does not fully comply with a cease-fire in Ukraine. The two met, on Monday, on the sidelines of a U.N. Human Rights Council meeting in Geneva, where Kerry outlined human rights violations in Russian-annexed Crimea and eastern Ukraine. VOA State Department correspondent Pam Dockins reports from Geneva.

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U.S. Secretary of State John Kerry has told his Russian counterpart, Sergei Lavrov, that his country could face further consequences to what he called its “already strained economy” if Moscow does not fully comply with a cease-fire in Ukraine. The two met, on Monday, on the sidelines of a U.N. Human Rights Council meeting in Geneva, where Kerry outlined human rights violations in Russian-annexed Crimea and eastern Ukraine. VOA State Department correspondent Pam Dockins reports from Geneva.

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Diagnosing infections such as HIV requires expensive clinical tests, making the procedure too costly for many poor patients or those living in remote areas. But a new technology called lab-on-a-chip may make the tests more accessible to many. VOA’s George Putic reports.

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Afghan officials have expressed concern over reports of a crackdown on Afghan refugees in Pakistan following the Peshawar school attack in December. Reports of mass arrests and police harassment coupled with fear of an uncertain future are making life difficult for a population that fled its homeland to escape war. VOA’s Ayesha Tanzeem reports from Islamabad.

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Despite the ongoing ceasefire in Ukraine, soldiers in the city of Mariupol fear that pro-Russian separatists may be getting ready to attack. The separatists must take or encircle the city if they wish to gain land access to Crimea, which was annexed by Russia early last year. But Ukrainian forces, many of them volunteers, say they are determined to defend it. Patrick Wells reports from Mariupol.

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As low oil prices and Western sanctions force Russia's economy into recession, thousands of Moscow restaurants are expected to close their doors. Restaurant owners face rents tied to foreign currency, while rising food prices mean Russians are spending less when they dine out. One entrepreneur in Moscow has started a dinner kit delivery service for those who want to cook at home to save money but not skimp on quality. VOA's Daniel Schearf reports.

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The United States and Cuba say they have made progress in the second round of talks on restoring diplomatic relations more than 50 years after breaking off ties. Delegations from both sides met in Washington on Friday to work on opening embassies in Havana and Washington and iron out key obstacles to historic change. VOA’s Mary Alice Salinas reports from the State Department.

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One after another, presumptive Republican presidential contenders auditioned for conservative support this week at the Conservative Political Action Conference held outside Washington. The rhetoric was tough as a large field of potential candidates tried to woo conservative support with red-meat attacks on President Barack Obama and Democrats in Congress. VOA Political Columnist Jim Malone takes a look.

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New Yorkers take pride in setting world trends — in fashion, the arts and fine dining. The city’s famous biannual Restaurant Week plays a significant role in a booming tourism industry that sustains 359,000 jobs and generates $61 billion in yearly revenue. VOA's Ramon Taylor reports.

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Issues like the Keystone XL pipeline, fracking and instability in the Middle East are driving debate in the U.S. about making America energy independent. Recently, the American Energy Innovation Council urged Congress and the White House to make expanded energy research a priority. One beneficiary of increased energy spending would be the Brookhaven National Lab, where clean, renewable, efficient energy is the goal. VOA's Bernard Shusman reports.

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There has been a surge of interest in the American civil rights movement of the 1950s and '60s, thanks in part to the Hollywood motion picture "Selma." Five decades later, communities in the South are embracing the dark chapters of their past with hopes of luring tourism dollars. VOA's Chris Simkins reports.

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With the end of summer in the Southern hemisphere, the Antarctic research season is over. Scientists from Northern Illinois University are back in their laboratory after a 3-month expedition on the Ross Ice Shelf, the world’s largest floating ice sheet. As VOA’s Rosanne Skirble reports, they hope to find clues to explain the dynamics of the rapidly melting ice and its impact on sea level rise.

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A Lao dam project on a section of the Mekong River is drawing opposition from local fishermen, international environmental groups and neighboring countries. VOA's Say Mony visited the region to investigate the concerns. Colin Lovett narrates.